Fixed spelling error in release notes

Thanks @SEJeff
Fix stack trace introduced with 7c46123
Add version spec info to 0.13.0 release notes
Merge pull request #3691 from archtaku/docs

Add version spec info to 0.13.0 release notes
Removed default value for cwd

This was preventing the logic for divining the default value based on
the current user in the execution module meaning that states specifying
a non-root ``user`` param also needed to specify a ``cwd`` param.
Updated more occurances of a default cwd
Merge pull request #3692 from whiteinge/cmd-cwd-default

Removed default for cwd in various cmd states
Fix #3693 (variable ref'ed before assignment)

Also, fix another reference before assignment in the "test=True" code
block
Merge pull request #3695 from archtaku/issue3693

Fix #3693 (variable ref'ed before assignment)
Add config.py defaults for virt.images
Add virt.init, a command to init vms from basic input
Add the start of the virt runner
Get the outputter going for virt
Merge branch 'develop' of github.com:saltstack/salt into develop
Add vm_info and destroy to the virt runner
Updated limit to be escaped like before and after.
Import install command from setuptools if we use them.

This commit fixes bug with option --single-version-externally-managed.
Allow alternative executables

With this commit it is possible to use virtualenv with the init scripts.

For example, I have this in my /etc/default/salt:

```
SALTMASTER=/srv/venvs/venv-1/bin/salt-master
SALTMINION=/srv/venvs/venv-1/bin/salt-minion
SALTSYNDIC=/srv/venvs/venv-1/bin/salt-syndic
SALTAPI=/srv/venvs/venv-1/bin/salt-api
PYTHON=/srv/venvs/venv-1/bin/python
```
Fix the LSB header

I got complaints from insserv that the LSB header was not compliant. It was
missing required keywords, which must be there even if they are empty.
Add optional key argument to display subtree of pillar data

The output of pillar.data comprises a substantial chunk of data.
By introducing key selection on the dictionary, we can display
the subtree of immediate interest.

Inadequacy: Should allow for arbitrary keying into subsections
of the data. Current change is the simplest useful improvement.